Centrifugal pumping apparatus.



G. PAGEL.

CENTRIFUGAL PUMPING APPARATUS. APPLICATION msu ocr. s. 1915.

1,246,149. PatentedN0v.13,1917,

Inventor: Gustav Page L 9 HSLz-flt cps-neg:

15.- In the following specification Ihave de- UNITED? sTATEs PATENT oPPIoE. i

enlrsTAvF PAGEL', or GHARLQTTENBURG. GERMANY, AssIGNoR To GENERAL ELECTRIC QOMPANY, A CORPORATION or NEW YORK.

CENTRIFUGAL lPUMPING APPARATUS.

-ject of the King of Prussia, residing at Charlottenburg, Germany, have invented certain new and useful Improvements in Centrifugal Pumping Apparatus, of which the following is a specification.

The present invention. relates to centrifugal pumpin apparatus of the type comprising a com ined liquid pump and gas and vapor ump, and particularly to' such apparatus` or removing the water of condensa'- tion and the air, vapor, and uucondensed gases from 'condensers scribed my invention as applied to such use but it is to be understood that it is not necessarily limitedl thereto. The object ot' the invention is to provide an improved structural arrangement 'for an apparatus of this type.

For a consideration ot what I believeto be noveland my invention, attention is di- Referring to the drawing` 3 indicates a driven shaft which will be suitably supported in a bearing in any approved manner and which rojects through a stutling box 4 in the casing of the pumping apparatus. The pumping apparatus comprises essentially two pumps, a condensate pump and an air andvapor pump of the water throwing type.A

5 indicates the impeller of the water pump and 6 the impeller of the air pump. They are mounted in spaced relation on the end of the shaft 3 which' may be driven by any suitable motor. The casing for thel water pump comprises an annular portion 7 1n vwhich stuin box 4 is arranged and which houses the impeller 5 and the discharge scroll 8 which surrounds the impeller 5 and terminates in a dlscharge openmg m the usual manner. This dlscharge opemng does not show in either of the views of the draw ing. 9 indicates the admission conduit which is' common to both the water and air pumps, and 10 indicates the suction chamber of the` water pump from which water passesv Specication of LettersPatent.

through the admission openings 11 of the nnpeller to the vanes 12. The suction chamber. 10 is formed by a wall or partition 13 whichsurrounds the shaft and the eyel of Patented Nov. 13, 1917.

Application led October 8, 1915. Serial No. 54,750. l

the impeller and defines an admission opening 1l at the bottom of the chamber and the two passages 15 andy 16 through which the water to be pumped A flows to the suction chamber. The object of this arrangel'nent is to provide a liquid seal or trap forthe water pump to prevent air from bein sucked into the impeller 5 at times when t esupply of water to the impeller is limited. It will be clear that were this partition not present,- when the supply of water for the pump was less than the total capacity of the chamber, that. the upper portion vof the inlet of the impeller would receive no water. This would nuijn that it would suck in air which is often objectionable, as for example, where the con-l densate is being used as feed Water for boilers. This is because the presence of air in the water may cause corrosionofthe .boiler wall. The` partition 13 projects down so tar that air cannot enter the admission opening 14 even at the lowest level ofthe water on the suction side of the pump. 18 indicates a wall or dam in the admission conduit 9* which deinesl a passage 19 for conducting air and vapor to the air pump, here specifically illustrated as an air pumpy of the water throwing type and also prevents water from entering the air pump. The paths of the water and air in passing to their respective impellers are indicated by the arrows in Fig.2. 20 indicatesthe throwing water inlet through which throwing water is led to the impeller 6. Surrounding the impeller-v Gis an annular. discharge ring or member 21,

there being an annular space or-passage asindicated at 22 between them. The air, vapor and other gases tiow from the passage 19 to the annular chamber 23 at the side of the impeller 6 which chamber communicates with the space 22. The discharge ring 21 is provided with suitable directing vanes 24 forming between them suitable discharge passages which communicate at their outer ends with the discharge scroll 25. The discharge opening or conduit for the air pump is indicated at 26. The impeller 6 1s provided with suitable vanes 27 l in the usual y manner. U

As already stated, it 1s desirable to prebe formed on veither the shaft or on the' inner surface ofthe hub, A,the latter arrangement being shown in the present instance.

I-then provide a liquid seal for this paci@ ing which comprises a ivall 29 shaped to form a cup or reservoir 30. 3l is a passage 2o which connects this cup. or reservoir with the packin. Formed integral with the inlet conduit is a projecting ledge 3:2 which directs the Water entering by Way of conduit 9 linto lthe reservoir 30, the excess spilling over the edge of the same and pass-4 ing through the passages l5 and 16 to'the suctionl chamber of the Water pump. Water from the reservoir runs down through passage 31- to the packing to sealit. By 311| this arrangement. it will be seen that l utilize the water of condensation which is very readily available and which is the medium being pumped, as my sealing liquid, and that so long as there is any Water- 35r being pumped there will always be a supply for sealing the packing. Furthermore. this Water which flows through the paci;n ing escapes directly to the suction side of Jthe pump so that it is not lost and is avail-.

able for feed yunter. The arrangement thus avoids the necessity of providing a separate liquid under pressure for sealing purposes. and avoids any losses of the liquid used for p packing. in somein s, it may be de- 451 sirable to prevent air from entering the suction chamber 1G of the condensate pump by Way vof passage 31 and thence througl-i the packing, when the .pump is standing idle and to" this end a'suitable iioat controlled'valve may be provided which is controlledv by the level of the liquid in the' reservoir 30, and which closes the passage 3l. when all or substantially all of the liquid has run out of the reservoir. "3y Way of example l have illustrated a valve 38 which floats on the liquid` and acts to close the passage 3l when thelevel therein reaches a predetermined loiv point.

In operation the condensate. and the air,

vapor, and other gases from the condenser pass through the conduit 9 and the condensate is directed by the 'Jv-all i8 and lip 32 into the reservoir 30, a portion of it passingl from there through passage 3l to seal the packing and the excess spilling over the derstood manner.

edge of the cup and running through passages l and 16 to the suction. chamberfylO from which it passes to the impeller and is pumped out, as is well understood. The air, vapor, and other gases ententhrough the passage 19 to the chamberQ of the air pump. The throwing Water enters the impeller 6 through the inletl Q0 and is discharged across` the gap or annular space Q2 entraining air and other gases in its passage from the chamber 23 in the Well unV The throwing water and ent-raining air and gases are discharged'by Way of the scroll 25 and discharge conduit 26.

ln accordance. with the pro-visions ofthe patent statutes, l have described the principle of operation of my inventiomtogether with the apparatus Whichl noivc'on'sider to represent the best embodiment thee'f; 85 but l desire to have it understood 'that the apparatus shown is only illustrative and that the invention can be carried out by other means. p

li'hat I claim as new and desire to secure 90 by Letters Patent ot the United States is l. ln combination. a combined liquid and gas pump having an intermediate Wallin common. a shaft` passing through it, a. pack- 'ing for the shaft. means forming a liquid 95 seal for said inuflnng., and means formlng a trap on the suction side of the liquid pump which is filled with liquid being pumped to also form a liquid seal, said liquid seals acting to prevent gaseous material from being sucked into the liquid pump. A

ln combination a combined liquid pump and gas pump haying -an intermediate wall in common and a shaft. passing through it which carries the impellcrs for the pumps, a' packing for the shaft Where it 4passes through the Wall. means for sup- 3. nlying liquid being pumped to said packing to forni a seal for it. and means forming a trap onthe suction side of the liquid pump which filled with liquid being pumped to also form a liquid seal, said liquid seals actingto prevent gaseous material. from being -suckediinto the liquid pump. l

3. A. combined liquid and gas pump comprising a lcasing, a shaft, impellers mounted on the shaft in spaced relation, a wall dividing the region between the impellers into tivo chambers, a partition in one of the chambers Which surrounds the eye ofthe impeller or the liquid pump and has an opening at its lowest point, a .packing for the shaft Tvhere it passes through said Wall, 125 and means for supplying liquid being pumped to said packingv to seal it.

4. The combination of a casing having an inlet. an impeller therein, a shaft for the impeller, a partition member in the casing 130 which surrounds the eye of the impeller and has an opening at its lowest point for admitting liquid tothe iinpeller, said partition member deliniiig a passage for conveying liquid to the opening, a packing for the shaft, and means :t'or supplying liquid being pumped tothe packing to seal it.

p 5. The combination of a casing having an inlet, an impeller therein. a shaft for, the iiiipeller, a partitionmember in the casing which surrounds the eve of the inipellei' and has an opening at its lowest point for admitting liquid to the impeller, said partition member defining apassage for conveying liquid to the opening, a packing for the shaft` a lreservoir in4 the inlet above the packing into which liquid being pumped is directed, and means forming a assage connecting said reservoir to the pac ting to toim a liquid seal tlierefoix G. In a combined liquid pump and gas pump of the water throwing type, comprising a shaft with spaced iinpellers thereon, and a partition wall between the iinpellers which defines two chambers one for the liquid pump and the other for the gas pump, of a packing for the shaft where it passes through the partition, and means for directing liquid being pumped to said packing to seal it so as to prevent gases from leaking around the shaft from one chainbcr to the other.

7. In a combined liquid pump and gas pump of the water throwing type, compris` ing a shaft'with spaced inipellers thereon, and a partition wall between the impellers whichl defines two chambers one .for the liquid pump.

pump and the other for the gasof a packing for the shaft. where it l passes through the partition, a reservoir passage connecting the reservoir to the packing to forni a seal for it.

8. In a combined liquid pumpV and gas pump of the water throwing type, comprising a casing, an inlet thereto, 'a shaft with spaced iinpellers thereon, and a partition wall between the impellers which defines two chambers one for the liquid pump and the other for the gas pump, of a packingv for the shaft where it passes through the pai-titioina reservoir in the inlet above the.

A in said inlet for directing the liquid to the liquid pump and the gases to the gas pump, a partition meniberin thechamber for the liquid pump which surrounds the eye of the impeller and has an opening at its lowest point. through which liquid` is fed to such inipeller, a packing for the shaft where it passes through the partition, a. reservoir above' the packing to Which the li uid being A pumped is supplied, and means orming a passage connecting the reservoir to the pack-' revent ing to forni a seal' for it so as to gases from leaking around the sha t from one chamber to the other.l

In witness whereof, I have hgreunto set my hand this G day of September, 1915.

Y GUSTAV PAGEL.

Genies of thi-s patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. C.

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